Test platform for detecting durability of laser product in machine vision system

Abstract

The utility model provides a test platform for detecting the durability of a laser product in a machine vision system, which comprises a constant temperature box, a vision detection part and an electrical control part, a laser driver module is arranged in the constant temperature box, and the vision detection part comprises a laser emitting device, a linear array camera and a battery piece motion platform; the battery piece moving platform comprises a linear motor, a sliding rail and a battery piece supporting plate, and the electrical control part is fixed to the top of the constant-temperature box and comprises a temperature control module, a motor control module and a laser power supply triggering module. According to the utility model, the durability of a photovoltaic detection laser product can be tested, the constant temperature box controls the working environment temperature of the driving module, the driving module works in a relatively stable working environment, the laser emitting device is arranged above the linear motor and is matched with the linear array camera to output images, and the images are continuously output and recorded in a test time range. And according to stage comparison verification, obtaining a durability result of the laser product.

Description

Technical Field

[0001] The utility model relates to the technical field of machine vision, in particular to a test platform for detecting the durability of laser products in a machine vision system. Background Art

[0002] Machine vision technology uses machines to replace human eyes for measurement and judgment. Its most basic feature is to improve the flexibility and automation of production. In some dangerous working environments that are not suitable for manual work or where artificial vision cannot meet the requirements, machine vision is often used to replace artificial vision. At the same time, in large-scale repetitive industrial production processes, the use of machine vision detection methods can greatly improve production efficiency and automation. In a machine vision system, it is crucial to obtain a high-quality processable image. The success of the system depends first on ensuring good image quality and obvious features. The failure of a machine vision project is mostly due to poor image quality and unclear features. To ensure a good image, a suitable light source must be selected.

[0003] As the core of solar modules, the quality of solar cells directly affects the photoelectric conversion efficiency. Among solar cell products, silicon semiconductor materials are the main materials, among which monocrystalline silicon and polycrystalline silicon are the representatives. After the production is completed, the quality of solar cells is inspected by machine vision system. The inspection equipment mostly uses machine vision technology for inspection.

[0004] In the existing machine vision system inspection equipment for inspecting battery cells, lasers with good directivity are generally used as the preferred light source. Therefore, the stability of the laser directly affects the results of machine vision inspection, and even affects the inspection links in the entire production process and the quality of the product. Therefore, the durability test of laser products is particularly critical for machine vision inspection equipment. Therefore, it is necessary to propose a test platform for detecting the durability of laser products in machine vision systems. Utility Model Content

[0005] The purpose of the utility model is to provide a test platform for detecting the durability of laser products in machine vision systems, which can test the durability of photovoltaic detection laser products, continuously output and record images within the test time range, and obtain the durability performance results of laser products based on phased comparison and verification.

[0006] According to one purpose of the utility model, the utility model provides a test platform for detecting the durability of laser products in a machine vision system, comprising a constant temperature box, a visual inspection unit and an electrical control unit, wherein a laser driver module is arranged in the constant temperature box, the visual inspection unit comprises a laser emitting device, a linear array camera and a battery cell motion platform, the laser emitting device is connected to the laser driver module; the battery cell motion platform comprises a linear motor, a slide rail and a battery cell tray, the battery cell tray is slidably connected to the slide rail, the output shaft of the linear motor is connected to a lead screw, the lead screw passes through the battery cell tray and is threadedly connected to the battery cell tray, the electrical control unit is fixed on the top of the constant temperature box, the electrical control unit comprises a temperature control module, a motor control module and a laser power supply trigger module, the motor control module is connected to the linear motor, and the laser power supply trigger module is connected to the laser driver module.

[0007] Furthermore, it also includes a main frame, the constant temperature box is fixed on the lower part of the main frame, the visual detection part is fixed on the upper part of the main frame, and the slide rail is fixed on the main frame.

[0008] Furthermore, a temperature sensor is provided in the thermostatic box, and the temperature sensor is connected to the temperature control module.

[0009] Furthermore, a module support plate is provided inside the constant temperature box, the module support plate is in the shape of a mesh structure, and the laser driver module is arranged on the module support plate.

[0010] Furthermore, a cross-flow fan is provided inside the thermostatic box, a vent is provided on a side wall of the thermostatic box, and a one-way ventilation membrane is provided on the vent.

[0011] Furthermore, a laser mounting bracket and a camera mounting bracket are fixed on the main frame, the laser emitting device is fixed on the laser mounting bracket, and the linear array camera is fixed on the camera mounting bracket.

[0012] Furthermore, limit sensors are respectively provided at both ends of the slide rail, and the limit sensors are connected to the motor control module.

[0013] Furthermore, the temperature control module is connected to the cross flow fan.

[0014] Furthermore, a temperature control screen is provided on the side wall of the electrical control unit, and a temperature range display screen and buttons are provided on the temperature control screen.

[0015] Furthermore, a fine-tuning structure adjustment frame is provided on the laser mounting bracket, and the fine-tuning structure adjustment frame includes a height adjustment frame and a pitch adjustment frame.

[0016] The technical solution of the utility model can test the durability of photovoltaic detection laser products, and can simultaneously realize the use of laser products in working conditions such as photoluminescence and laser penetration. The constant temperature box controls the working environment temperature of the drive module. The laser driver module is placed in the constant temperature box and works in a relatively stable working environment. The laser emitting device is placed above the linear motor and cooperates with the linear array camera to output images. The images are continuously output and recorded within the test time range. The durability performance results of the laser product are obtained based on periodic comparative verification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0019] Figure 2 Another structural schematic diagram of an embodiment of the utility model;

[0020] Figure 3 It is a partial structural diagram of the electrical control unit of the embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of a linear motor according to an embodiment of the utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the laser mounting bracket according to an embodiment of the utility model;

[0023] In the figure: 1. Main frame; 2. Constant temperature box; 3. Ventilation port; 4. Observation window; 5. Laser emitting device; 6. Linear array camera; 7. Linear motor; 8. Slide rail; 9. Battery cell support plate; 10. Lead screw; 11. Battery cell; 12. Temperature control screen; 13. Height adjustment frame; 14. Pitch adjustment frame. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] Example 1

[0028] like Figure 1-Figure 5 As shown,

[0029] A test platform for detecting the durability of laser products in a machine vision system, comprising a main frame 1, a visual detection unit and an electrical control unit, wherein:

[0030] A constant temperature box 2 is provided at the lower part of the main frame 1. A temperature sensor is provided inside the constant temperature box 2. The constant temperature box 2 is used to place the laser driver module.

[0031] Specifically, a module tray is provided inside the thermostat 2, and the module tray is in the shape of a mesh structure, which can accommodate the placement of laser driver modules of various shapes. The laser driver module is placed on the module tray in the thermostat 2, and the tray is in the mesh structure. The laser driver module can be placed in any direction, so that the test results are not affected by the placement method.

[0032] A cross-flow fan is fixed inside the thermostat 2. Compared with ordinary fans, the advantage of the cross-flow fan is that the exchange volume is large and balanced, which can better balance the air flow temperature inside the thermostat 2, so that the inside of the thermostat 2 will not have a large temperature difference due to the air flow. A vent 3 is provided on the side wall of the thermostat 2, and a one-way ventilation membrane is provided on the vent 3. An observation window 4 is also provided on the thermostat 2 to facilitate observation of the internal situation.

[0033] The visual inspection unit is fixed on the upper part of the main frame 1. The visual inspection unit includes a laser emitting device 5, a linear array camera 6 and a cell motion platform. A laser mounting bracket and a camera mounting bracket are fixed on the main frame 1. The laser mounting bracket can be used to install laser emitting devices 5 of different specifications. The camera mounting bracket is used to install the linear array camera 6. The linear array camera 6 is used in conjunction with the laser emitting device 5. The laser emitting device 5 is connected to the laser driver module inside the constant temperature box 2, and the laser emitting device 5 is used to emit laser.

[0034] The battery cell motion platform includes a linear motor 7, a slide rail 8 and a battery cell support plate 9. The slide rail 8 is fixed on the main frame 1. The battery cell support plate 9 is slidably connected to the slide rail 8. The output shaft of the linear motor 7 is connected to the lead screw 10. The lead screw 10 passes through the battery cell support plate 9 and is threadedly connected to the battery cell support plate 9. The linear motor 7 can drive the battery cell support plate 9 to move back and forth on the slide rail 8.

[0035] The top of the battery cell tray 9 is used to place the battery cell 11. A groove is provided on the top of the battery cell tray 9, so that the battery cell 11 will not shake due to inertia when the linear motor 7 moves; limit sensors are provided at both ends of the slide rail 8, and the movement of the battery cell tray 9 is obtained through the limit sensors. The limit sensors transmit signals to the electrical control unit, and the electrical control unit controls the linear motor 7 to drive the battery cell tray 9 and the battery cells 11 on the battery cell tray 9 to perform reciprocating cycles within the range of the two limit sensors.

[0036] The electrical control unit is fixed on the top of the thermostat 2, and the electrical control unit includes a temperature control module, a motor control module and a laser power supply trigger module; the temperature control module is connected to the temperature sensor in the thermostat 2, the motor control module is connected to the linear motor 7, and the laser power supply trigger module is connected to the laser driver module. The electrical control unit is also provided with a switching power supply with different voltages, which is adapted to the external socket and can provide different voltages to the outside. The motor control module includes a motor driver, and the linear motor 7 is controlled by the motor driver.

[0037] The temperature control module is also adapted to the cross-flow fan. The temperature control module controls the cross-flow fan according to the collected temperature. As the heat generated by the internal laser module accumulates, the heat inside the thermostat 2 is balanced. The laser power supply trigger module includes 5V, 12V and 24V power sockets and a sensor output interface.

[0038] A temperature control screen 12 is provided on the side wall of the electrical control unit. The temperature control screen 12 is provided with a temperature range display screen and a setting button. The temperature range display screen is used to display the real-time temperature and the temperature setting range. By setting the start temperature and the stop temperature in the screen display through the setting button, the fan inside the temperature box can be controlled to achieve a constant temperature effect.

[0039] The temperature sensor in the thermostat 2 is connected to the temperature control screen 12. Based on the durability test of the laser product, the working environment temperature of the control module is controlled. The internal temperature of the thermostat 2 is set through the buttons or knobs on the temperature control screen 12. Referring to the usage process, first set the start temperature and stop temperature of the cross flow fan in the temperature control screen 12 to maintain the temperature balance in a certain range in the thermostat 2.

[0040] The laser driver module is placed in the thermostat 2. Since there is a heat source inside the laser driver module, it will continuously radiate heat into the thermostat 2, causing the temperature inside the thermostat 2 to rise. Since the vent 3 is a one-way vent 3, the vent 3 does not have a ventilation function at this time, and the thermostat 2 is in a closed state relative to the outside. When the temperature inside the thermostat 2 reaches the cross-flow fan starting temperature, the cross-flow fan starts, and the cross-flow fan brings out the internal hot air. Due to the pressure difference between the inside and the outside at this time, the one-way ventilation membrane at the vent 3 is blown up, and the external air enters the inner cavity to balance the internal temperature. When the temperature drops to the set temperature, the cross-flow fan stops, thereby achieving a relatively stable constant temperature environment.

[0041] When the utility model is used: after the laser emitting device 5 and the linear array camera 6 are installed, the linear motor 7 is started by the start switch on the temperature control screen 12 on the electrical control unit, the battery sheet 11 reciprocates under the action of the linear motor 7, and the linear array camera 6 continuously collects and records images.

[0042] When in use, the temperature inside the thermostat 2 is controlled by the thermostat 2 temperature control module in the control circuit. The temperature sensor inside the thermostat 2 transmits temperature information to the temperature control module of the thermostat 2. According to the setting, the cross flow fan is controlled to start and stop to keep the temperature range inside the thermostat 2 balanced. The laser driver module is placed in the thermostat 2 to work in a relatively stable working environment. The laser emitting device 5 is placed above the linear motor 7 and cooperates with the linear array camera 6 to output images. The images are continuously output and recorded within the test time range. The durability performance results of the laser product are obtained based on periodic comparison and verification.

[0043] When in use, after the laser driver module, the laser emitting device 5 and the linear array camera 6 are installed, the laser driver module is started to make the laser emitting device 5 work, and imaging is performed through the linear array camera 6. The micro-head in the micro-adjustment frame is used to perform multi-dimensional fine-tuning until the requirements are met.

[0044] In this embodiment, the laser mounting bracket includes a fine-tuning structure adjustment frame, which includes a height adjustment frame 13 and a pitch adjustment frame 14. The height adjustment frame 13 is fixed on the column of the main frame 1, and moves up and down on the column of the main frame 1 and is fixed by bolts; the pitch adjustment frame 14 is rotatably connected with the height adjustment frame 13, and the laser emitting device 5 is fixed on the pitch adjustment frame 14. The pitch adjustment frame 14 can change the tilt angle with the height adjustment frame 13, thereby adjusting the pitch angle of the laser emitting device 5. The head end of the laser emitting device 5 is provided with a differential head, which can fine-tune the laser position excited by the laser emitting unit, and record and compare it through camera imaging after reaching the appropriate position.

[0045] The utility model adopts a near-infrared laser light source, and utilizes the strong directivity of the laser to penetrate the silicon wafer (cell 11) to realize the simultaneous detection of internal and edge defects. After matching the high-definition linear array camera 6, it can be used to detect defects such as hidden cracks, dirt, broken edges and missing corners of the original silicon wafer. It uses the PL (photoluminescence) principle to detect broken edges, missing corners, hidden cracks and concentric circle defects. The equipment is mainly used for durability performance testing in the product development and trial production stage. The main observation points of the test are: whether the laser will have power attenuation problems after long-term operation, whether the laser brightness will be different under different temperature conditions, and whether the laser will affect the laser life if it is operated for a long time at a certain temperature.

[0046] The utility model is a test platform for detecting the durability of laser products in machine vision systems. Different laser products can be installed to test the durability of photovoltaic detection laser products, and the use of laser products in working conditions such as PL (photoluminescence) and laser penetration can be realized at the same time. The constant temperature box 2 can set the temperature within a certain range. The constant temperature box 2 has a built-in cross-flow fan and a temperature sensor. The temperature sensor feeds back the temperature to the temperature control module in real time. The system controls the start and stop of the cross-flow fan to keep the temperature in the constant temperature box 2 within the set range; the battery cell support plate 9 is a hollow structure, so that the battery cell 11 is supported on four sides and suspended in the middle. A variety of installation and adjustment structures are provided above the product detection part, which can be installed with laser lenses, industrial linear array cameras 6, area array cameras and other products; the constant temperature box 2 controls the working environment temperature of the drive module, and keeps the laser in working state at the same time. With the camera imaging, the durability performance of the product can be clearly compared and recorded.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A test platform for detecting the durability of laser products in machine vision systems, characterized in that: It includes a constant temperature box, a visual inspection unit and an electrical control unit. A laser driver module is arranged in the constant temperature box. The visual inspection unit includes a laser emitting device, a linear array camera and a battery cell motion platform. The laser emitting device is connected to the laser driver module. The battery cell motion platform includes a linear motor, a slide rail and a battery cell support plate. The battery cell support plate is slidably connected to the slide rail. The output shaft of the linear motor is connected to a lead screw. The lead screw passes through the battery cell support plate and is threadedly connected to the battery cell support plate. The electrical control unit is fixed on the top of the constant temperature box. The electrical control unit includes a temperature control module, a motor control module and a laser power supply trigger module. The motor control module is connected to the linear motor, and the laser power supply trigger module is connected to the laser driver module.

2. The test platform for detecting the durability of laser products in a machine vision system according to claim 1, characterized in that: It also includes a main frame, the constant temperature box is fixed on the lower part of the main frame, the visual detection part is fixed on the upper part of the main frame, and the slide rail is fixed on the main frame.

3. The test platform for detecting the durability of laser products in a machine vision system according to claim 1, characterized in that: A temperature sensor is arranged in the thermostatic box, and the temperature sensor is connected to the temperature control module.

4. The test platform for detecting the durability of laser products in a machine vision system according to claim 1, characterized in that: A module support plate is provided inside the constant temperature box, the module support plate is in a mesh structure, and the laser driver module is arranged on the module support plate.

5. The test platform for detecting the durability of laser products in a machine vision system according to claim 1, characterized in that: A cross-flow fan is arranged inside the thermostatic box, a vent is arranged on the side wall of the thermostatic box, and a one-way ventilation membrane is arranged on the vent.

6. The test platform for detecting the durability of laser products in a machine vision system according to claim 2, characterized in that: A laser mounting bracket and a camera mounting bracket are fixed on the main frame, the laser emitting device is fixed on the laser mounting bracket, and the linear array camera is fixed on the camera mounting bracket.

7. The test platform for detecting the durability of laser products in a machine vision system according to claim 1, characterized in that: Limit sensors are respectively arranged at both ends of the slide rail, and the limit sensors are connected to the motor control module.

8. The test platform for detecting the durability of laser products in a machine vision system according to claim 5, characterized in that: The temperature control module is connected to the cross flow fan.

9. The test platform for detecting the durability of laser products in a machine vision system according to claim 1, characterized in that: A temperature control screen is arranged on the side wall of the electrical control unit, and a temperature range display screen and buttons are arranged on the temperature control screen.

10. The test platform for detecting the durability of laser products in a machine vision system according to claim 6, characterized in that: The laser mounting bracket is provided with a fine-tuning structure adjustment frame, and the fine-tuning structure adjustment frame includes a height adjustment frame and a pitch adjustment frame.

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